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{$mode objfpc}
{$H+}
{
This file is part of Free Pascal build tools
Copyright (c) 2005 by Michael Van Canneyt
Implements string substitutions
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
unit usubst;
interface
uses SysUtils,Classes;
// Add N=V pair to list.
Procedure AddToList(List : TStrings; Const N,V : String);
// Split NV to N/V and call AddToList
Function AddPair(List : TStrings; Const NV : String) : Boolean;
// Perform substitutions in S, from List.
Function DoSubStitutions(List : TStrings; Var S : String) : Integer;
implementation
Procedure AddToList(List : TStrings; Const N,V : String);
var
I : Integer;
begin
I:=List.IndexOfName(N);
If (V='') then
begin
If (I<>-1) then
List.Delete(I)
end
else
begin
If (I=-1) then
List.Add(N+'='+V)
else
List[I]:=N+'='+V;
end;
end;
Function AddPair(List : TStrings; Const NV : String) : Boolean;
Var
P : Integer;
N,V : string;
begin
P:=Pos('=',NV);
Result:=(P<>0);
If Result then
begin
V:=NV;
N:=Copy(V,1,P-1);
Delete(V,1,P);
AddToList(List,N,V);
end;
end;
Function DoSubstitutions(List : TStrings; Var S : String) : Integer;
Var
N,T : String;
P : Integer;
begin
Result:=0;
T:=S;
S:='';
P:=Pos('%',T);
While (P>0) do
begin
S:=S+Copy(T,1,P-1);
Delete(T,1,P);
If (Length(T)>0) then
if (T[1]='%') then
begin
S:=S+'%';
Delete(T,1,1);
end
else
begin
P:=Pos('%',T);
If (P=0) then
S:=S+'%'
else
begin
N:=Copy(T,1,P-1);
Delete(T,1,P);
S:=S+List.Values[N];
end;
end;
P:=Pos('%',T);
end;
S:=S+T;
end;
end.
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